Pedra hume, also known as alum (specifically potassium alum), has a long history of traditional use in oral care, particularly for supporting gum health. Its astringent and antimicrobial properties have made it a common home remedy in various cultures for conditions such as bleeding gums, mouth ulcers, and minor oral wounds. Traditionally, it is dissolved in water and used as a mouth rinse or applied directly to affected areas to reduce bleeding and promote healing.

Scientifically, there is limited but suggestive evidence for alum’s efficacy in oral hygiene. Some in vitro and small clinical studies have demonstrated that alum possesses antibacterial activity against oral pathogens and can reduce gum inflammation when used as a mouthwash. However, the number and quality of these studies are limited, and most clinical guidelines do not formally recognize alum as a treatment for gum disease. Safety concerns regarding the use of alum, particularly in higher concentrations or with prolonged use, have also been raised, as it may cause tissue irritation or toxicity.

In summary, the use of Pedra hume (alum) to support gum health is primarily based on traditional practices, with some limited scientific support. It is not a mainstream or widely recommended intervention in modern dental care.